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Abstract

An extended cavity Ti:Sapphire oscillator exhibits stable operation for positively chirped pulses, while in the negative chirp regime multiple pulses are present in the cavity. At the border of these regimes automodulations, being an effect of the interplay between population inversion, laser medium polarization and the laser pulse field, appear. Two particular instabilities: period doubling and chaotic behavior of the pulse train envelope are observed. Complex temporal evolution of the pulse spectrum within the modulation period is investigated.

Recorded pulse train in the AM regime (a). AM period as a function of the laser pump power (b). Pulse trains in the AM period doubling regime (c). One of the pulse trains in the AM period doubling regime (c) recorded with the photodiode placed after the monohromator tuned to 758 nm (d).

Spectrally resolved pulse train measured in the AM regime. Pulse train profile is shown on the top and the integrated spectrum (red), compared with the averaged spectrum measured independently (black) on the right.

Recorded pulse trains of the AM in the chaotic regime (a) and one of its spectral components (centered at 758 nm) (b). Different, “stable-looking” pulse train in the chaotic regime (c) and one of its spectral components at 758 nm (d).